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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

32725 results found.

  1. GRB 051227, optical observation
  2. GRB051117B: optical observation
  3. Konus-Wind observation of GRB 051221A
  4. GRB 051221A: MDM Optical Observations
  5. GRB 051221A: Detection at 251nm with Swift UVOT
  6. GRB 051221A: Chandra Afterglow Position
  7. GRB 051221A: Refined spectral and temporal analysis of the Swift-BAT short hard burst
  8. GRB 051221B: ROTSE-III Optical Limits
  9. GRB 051221B: TAROT optical limits
  10. GRB 051221A: WSRT Radio Observations
  11. GRB 051221: Redshift from Gemini
  12. GRB 051221: Continued fading of optical afterglow
  13. GRB 051221B: Refined analysis of the Swift-BAT burst
  14. Possible GRB 051221B: MDM Optical Detection
  15. GRB 051221A: RAPTOR Fading Counterpart Constraint
  16. Possible GRB 051221B: Swift XRT position
  17. GRB 051221: Discovery of fading optical afterglow
  18. GRB 051221: Swift XRT refined analysis
  19. GRB 051221: Swift/UVOT upper limits
  20. GRB 051221: Possible nearby cluster
  21. GRB 051221: Correction to GCN #4368
  22. GRB 051221: Gemini observations
  23. GRB 051221: Improved astrometry of the IR counterpart
  24. GRB051221: K-band source
  25. GRB 051221: XRT position
  26. GRB 051221: Refined analysis of the Swift-BAT short hard burst
  27. GRB 051221: IR Observations at GRB+1hr
  28. Refined analysis of the SWIFT J1626.6-5156
  29. Refined analysis of the Swift-BAT detection of the RS CVn star II Peg
  30. GRB051211A (=H3979): Refined Analysis
  31. GRB 051211B: optical afterglow
  32. GRB051211A: possible optical candidate
  33. Swift Trigger 172767 is not a GRB
  34. GRB 051215: near-infrared observations
  35. GRB051215 - SDSS pre-burst observations
  36. GRB 051215: A short GRB in a cluster?
  37. GRB051211B: Probable radio afterglow
  38. GRB051105: optical observations
  39. GRB 051213: Swift-BAT refined analysis
  40. GRB051211B: XRT refined analysis
  41. GRB051211B, RBO optical observations
  42. GRB 051211A: Swift/UVOT upper limits
  43. GRB 051211B: Swift/UVOT upper limits - correction
  44. GRB 051211B: Swift/UVOT upper limits
  45. GRB 051211A,optical observation
  46. GRB 051211B: Swift XRT confirmation of the afterglow
  47. GRB051211B: Liverpool Telescope observation
  48. GRB 051211b: RTT150 optical observations
  49. GRB051211b: P60 Observations
  50. GRB 051211A and GRB051211B: BOOTES simultaneous observations
  51. GRB 051211B: Swift XRT Observations
  52. GRB 051210: Swift/UVOT upper limits
  53. GRB 051210: Magellan Imaging
  54. GRB 051211: TAROT optical limits
  55. GRB 051211B: a possible optical detection by TAROT
  56. GRB 051211: Swift XRT upper limit
  57. HETE SXC localization of GRB 051211 (=H3979)
  58. GRB 051210: SALT detection limit
  59. GRB 051210: Swift XRT refined analysis
  60. GRB 051210: FRAM early limit
  61. GRB 051210: Swift-BAT refined analysis of a short burst
  62. GRB051210: Swift UVOT Observation
  63. GRB 051210: A short GRB in a cluster?
  64. IPN observations of SGR1806-20
  65. Swift XRT positions
  66. An extraordinary long burst on December 3 from SGR1806-20
  67. GRB051117B: optical observation
  68. GRB051111: optical observaion
  69. Swift-BAT trigger 165579 is not a GRB
  70. GRB051117b: No Swift/UVOT Detection
  71. GRB051111: Rc optical observations: correction
  72. GRB 051117A: Swift/UVOT Detection of an Afterglow: Correction
  73. GRB 051117A: Swift/UVOT Detection of an Afterglow
  74. GRB051111: Rc optical observations
  75. GRB051008: Suzaku WAM observation of the prompt emission
  76. GRB 051109B: GAO 150cm telescope Optical limit
  77. GRB 051109A : GAO 150cm telescope Rc-band detection
  78. GRB 051021 Optical Observations
  79. GRB 051117B: MARGE Optical Limits
  80. GRB 051117A and B: Radio Observations
  81. GRB 051117B: R and I observations of possible host galaxy
  82. GRB 051117b: NIR observations
  83. GRB 051117A: Refined analysis of the Swift-BAT burst
  84. GRB 051117B: Refined analysis of the Swift-BAT burst
  85. GRB051117A : XRT refined analysis
  86. GRB 051117B: Lulin R and I band observation
  87. GRB 051117B: Optical observations
  88. GRB 051117B: ROTSE-III Optical Limits
  89. GRB051114: results of the Swift-XRT observation
  90. GRB 051028 Optical Observations
  91. GRB 051109B : Nainital upper limits
  92. GRB 051114: Radio Observations
  93. GRB 051114: Swift-BAT refined analysis
  94. GRB 051114: Swift-BAT detection of a short burst
  95. GRB 051111: Further spectroscopic analysis
  96. GRB 051111: Radio afterglow
  97. GRB 051113: Swift-BAT refined analysis
  98. GRB051103: Radio Observations
  99. GRB 051109A Milagro GeV/TeV Observations
  100. GRB/SGR 050925: XMM-Newton ToO observation

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